JPS6291225A - air purifier - Google Patents

Abstract

PURPOSE:To offer an air-purifying agent with mechanical strength to be wrapped on the base of light weight by wrapping the soluble oxidizer on the mineral fiber paper. CONSTITUTION:after the mineral fiber paper made from mineral short fiber and made into desirable shape and size, for instance, such carriers as ceramic paper honeycomb of alumina silica family, is dipped in such soluble oxidizer as KMnO4 water solution and the like, the same is dried up to produce an air-purifying agent. The air-purifying agent thus produced is charged into the column and the like, and a wide scope of air pollutants or smelly substances such as H2S, SO2, NOx methyl mercaptan and the like are removed by passing the air containing pollutants or smelly substances through the said air-purifying agent charged in the column.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an air purifying agent, and more specifically, an a-free fiber paper carrying an agent used for efficiently removing air pollutants or malodorous substances. The present invention relates to an air purifying agent consisting of:

[Conventional technology] Conventionally, in factories, offices, homes, etc., air pollutants or malodorous substances contained in the air are removed as part of creating a comfortable environment in order to prevent and purify the air. Various methods are being used.

For example, there is an air purifying agent that contains an oxidizing agent such as potassium permanganate in a desired carrier such as activated alumina or zeolite, and uses this as a molded body such as a sphere, a cylinder, a udon shape, or a crushed lump.

Also known are paper, cloth, etc. that support activated manganese dioxide (Japanese Patent Application Laid-open No. 71786/1986).

On the other hand, the present inventors have developed an air purifying agent made of, for example, a honeycomb molded body of activated alumina or zeolite containing potassium permanganate as an improvement over the above-mentioned one (Japanese Patent Application Laid-open No. 108048/1983). .

On the other hand, in addition to the above-mentioned air purifying agents for honeycomb molded bodies, honeycomb molded bodies made of activated carbon are also known.

[Problems to be Solved by the Invention] In the above-mentioned air purifying agent in a molded body such as a sphere or a cylinder (udon shape), the molded body may be used as a filter made of a metal such as stainless steel or iron or a plastic mesh, a nonwoven fabric, etc. However, the pressure loss is high due to the high air ventilation resistance, and it is impossible to fill a sufficient amount of chemicals with an air purification device using a small fan. The molded product has the disadvantage of being easily powdered and lacking in strength.

On the other hand, a honeycomb molded body made of activated carbon is known as a method that utilizes the adsorption effect of activated carbon, but this honeycomb molded body cannot completely remove NO, ethylene, formalin, etc. among air pollutants or malodorous substances. zu, N) 13,
It has a low adsorption capacity for H2S, S02, etc., and there is a saturation phenomenon and desorption phenomenon of adsorption to activated carbon, and the adsorption capacity is small for gases with a dilute concentration.

On the other hand, in order to improve the shortcomings of item L, the present inventors have previously developed an air purifying agent for a honeycomb molded body containing potassium permanganate.

However, all such air purifying agents have poor mechanical strength, and not only do they require careful handling during the manufacturing process and use, but their large size also makes their weight quite significant.

In addition, air purification performance is highly dependent on the physical properties of the honeycomb molded body used as the base material, so it varies depending on the type of base material, so it is extremely important to ensure its quality with good reproducibility. .

Therefore, an object of the present invention is to provide an air purifying agent supported on a mechanically strong and lightweight base material.

[Means for Solving the Problems] The inventors of the present invention continued to earnestly research the base materials that affect the performance of air purifying agents, and found that fil! The present invention was completed after discovering that 111m paper was unexpectedly superior.

That is, the present invention relates to an air purifying agent characterized in that it is formed by supporting a soluble oxidizing agent as an active ingredient on a non-aluminum fiber paper.

The Kuroiso fiber paper used as a carrier in the present invention refers to an inorganic fiber paper made from natural or synthetic inorganic short fibers, and examples of inorganic fibers include asbestos, natural fish *mm such as wollastonite, and rock. wool, slag wool,
Glass FA Male, Silica TA Miyabi, Alumina Fiber, Silica・
Examples include alumina fibers, mullite IA fibers, zirconia fibers, carbon fibers, boron m-fibers or silicon carbide m-fibers, boron nitride fibers, etc., and even if these are am paper composed of one or more types of combinations. No problem.

Such Fa fiber paper may contain natural or synthetic inorganic powder as a filler during paper making,
Further, the thickness of the paper does not need to be particularly limited.

In the present invention, when inorganic fiber paper is used as a carrier, it is used in a desired shape and size, but the shape and size are not particularly limited because it is designed according to the mode of use as an air purifying agent. There is no need to

For example, in the shape of a circle, square, rectangular parallelepiped, etc., in the form of a single paper sheet, laminated, end layer cylindrical (baramkuchen type)
Alternatively, a molded body such as a honeycomb shape may be employed as desired.

In the present invention, a honeycomb molded body is particularly suitable, and the cross-sectional shape of the honeycomb molded body may be polygonal such as hexagon, pentagon, or triangle, or circular or cavernous. It may be designed as desired.

Next, in the present invention, the drug supported on the inorganic fiber paper has a soluble oxidizing agent as an active ingredient, and such oxidizing agents include, for example, potassium permanganate, potassium ferrate, and dichromate. Alkali, chromic anhydride primary hypohalite alkali.

At least one or two or more peroxides selected from calcium hypohalite, pyrroline m potassium peroxide, sodium percarbonate, sodium percarbonate, calcium peroxide, etc., among which permanganese Potassium acid is particularly preferred.

The amount of such a drug supported on the non-am fiber paper varies depending on the purpose of use, the type of drug, the physical properties of the inorganic fiber paper, etc., but is preferably in the range of 1 to 20% by weight per air purifying agent (dry basis). If it is less than 1% by weight, the life of the removal performance will be shortened, and if it exceeds 20% by weight, it will be difficult to carry the drug, and the pores of the honeycomb molded body will be blocked, reducing the removal efficiency. This is not desirable as it tends to decrease.

Note that using a soluble oxidizing agent as an active ingredient means that when supporting it on a carrier, not only the above-mentioned aqueous drug solution itself, but also silica sol, alumina sol, metal hydroxide, metal silicate, etc., may be added to the aqueous drug solution as necessary. This also includes the case where it is generated.

The air purifying agent according to the present invention is prepared by immersing the carrier in an aqueous drug solution, sol, or slurry of a specific concentration for a certain period of time, and then
It can be easily obtained by drying, impregnating and supporting a drug. At this time, the concentration of the aqueous drug solution is preferably as high as possible in order to increase the efficiency of impregnating the carrier, but an aqueous solution of 5 to 20% by weight is usually preferred.

The air purifying agent according to the present invention thus obtained is prepared into a desired shape and size, and then packed into a column or the like, and air containing air pollutants or malodorous substances is passed through the column. Air can be easily purified.

The air purifying agent according to the present invention can remove reducing gases, oxidizing gases, and a wide range of other air pollutants or malodorous substances through the oxidizing action of the drug or the adsorption action of the carrier. Specific examples of the substance include NO, SO2, H2S,
Amines such as trimethylamine and triethylamine,
Alkyl sulfides such as methyl sulfide, NH, mercaptans such as methyl mercaptan, aldehydes such as formalin, phenols, unsaturated hydrocarbons such as ethylene, and bad odors such as sewage equipment, animal odor, N urine odor, etc. A mixture of

In addition, in the case of removing N gas, it is necessary to use activated carbon together.

[Function] The action of removing air polluting gas based on the air purifying agent of the present invention is complicated depending on the type and concentration of the gas and the physical properties of the purifying agent, and the details are unknown, but the basic principle is It is understood that decomposition occurs due to the presence of a small amount of moisture retained in the purifying agent by adsorbing moisture in the air, which becomes the rate-limiting step in the reaction with the pollutant gas.

For this reason, the air purifying agent according to the present invention can exhibit excellent performance if it has sufficient moisture retention ability under low humidity conditions.

[Example] Next, the present invention will be described in more detail by showing Examples and Comparative Examples.

Example 1 Alumina-silica ceramic vapor honeycomb manufactured by Chias ■, product name Honeycle No. J: 119 and No.
2813), and activated alumina honeycomb (manufactured by Random Aluminum Smelting Company: trade name 5AH) as a comparison carrier.
-21) in total of three types of carriers (all with a size of 2hm
20no+X 50mm square prism) from 50 to 150
KMnO was supported by immersing it in a KMnO4 aqueous solution (liquid temperature 60°C) of 150 g/g for 15 minutes.

Then, it was dried to obtain an air purifying agent, which was then dried to give 22
The air purification ability was evaluated by filling a ma+X 22+amX 70 mm column.

(t) Air contaminated with approximately 5 ppm H2S gas (relative humidity 60%, room temperature) was collected at the space velocity (SV value) from the inlet of the 112s removal rate measurement column.
25,000 and a surface wind speed (LV value) of 0.35 Te, the H2S at the outlet was sampled over time, and a gastic detection tube (manufactured by Hokuyo Sangyo Co., Ltd.) (4LL: Sensitivity 0.0
5 ppm), 11. The removal rate of s was determined. The results are shown in Table 1.

(2) Measurement of S02 gas removal rate Measurement was carried out under exactly the same conditions as in the measurement of the H2S gas removal rate, except that air contaminated with SO2 gas was used instead of H2S gas. In addition, the measurement of S02 gas was carried out using a gastic detection tube (5La
) was used. The results are shown in Table 2.

(3) No. Measurement of gas removal rate Air purifier A (KMJ104 3 to 7% by weight supported) was followed by activated carbon honeycomb (20a+a+X 20ma+X
A column packed in series with NOx-contaminated air (room temperature).

The removal rate of NOX gas was measured at a relative humidity of 60% (relative humidity: 60%) and a sv value of 25,000-t'. Note that NOx (N
The continuous chemiluminescence method using a NOX meter was used to measure O+NO2) gas. The results are shown in Table 3.

Table 3 Example 2 Ceramic vapor mainly composed of silica-alumina (
Thickness 1. s Imm) into a roll and have a diameter of 30 mm.
■、150g/4 K made into a cylinder with a length of 6cm
An air purifying agent carrying 7.0% by weight of KMnO4 was prepared by immersing it in a MnO4 solution.

This air? 7. A circular column was filled with the oxidizing agent, and air (room temperature, relative humidity 70%) contaminated with about 2 ppm of methyl mercaptan was passed through the inlet with an Sv value of tsooo.
When looking at the removal rate, the removal rate remained at 97% or higher even 60 minutes after the start. The gas was measured using a gas detection tube.

Example 3 The same ceramic cuber as used in Example 2 was cut into strips (2hm x 50 mm), and an air purifying agent carrying 1% by weight of KMnO, 7, : was prepared in the same manner as in Example 2. . Fill the columns with H, S
When air contaminated with gas was passed through the tube, the H,S gas removal rate was essentially 100% even after 120 minutes.

Example 4 An air purifying agent carrying 6.5% by weight of 2Cr20t was prepared by immersing the ceramic vapor honeycomb used in Example 1 (Honey No. 3:119, manufactured by Nichias Corporation) in an aqueous potassium dichromate solution. . This was packed into a column in the same manner as in Example 1, and the air contaminated with SO2 gas was passed through.The removal rate was measured over time after 60 minutes, and the removal rate was 98% or more, meaning that the air contaminated with SO2 gas was passed through. gas could be removed.

Comparative Example 1 17 parts by weight of KMnOa crystal, 43 parts by weight of zeolite, 10 parts by weight of bentonite, 13 parts by weight of calcium silicate.

After thoroughly kneading a mixture consisting of 13 parts by weight of slaked lime, 5i0220 parts by weight, 16.5 parts by weight of colloidal silica, and 82.5 parts by weight of water, it was molded into 3 mm diameter pieces using an extrusion molding machine.
It was molded into a cylindrical shape with a length of 10 m+s, and then dried at 110°C to prepare an air purifying agent.

When the H2S gas removal rate of this product was measured under exactly the same conditions as those used for measuring H2S gas-contaminated air in Example 1, the results shown in Table 4 were obtained.

Table 4 Example 5 and Comparative Example 2 50 g of the same rolled cylindrical carrier used in Example 2
An air purifying agent (A) carrying 1% by weight of KMnO4 was prepared by immersing it in a KMnO4 solution at 60°C for 15 minutes and then drying it.

On the other hand, for comparison, the non-aam fiber paper before rolling was 508/
i' After being similarly immersed in a mixture of a KMnOa solution and a 1 wt % gelatin aqueous solution, and dried at 110 °C,
After the KMnO4 was reduced by uniformly spraying a 0.5% by weight aqueous formaldehyde solution over the entire surface, it was wound up into a roll and dried, which was used as an air purifying agent (B). This 2
Example 1
In the same manner as above, when air contaminated with SO2 gas was passed through the column and the removal rate was measured, the results shown in Table 5 were obtained.

Table 5 (values are %) Example 6 Honeycomb-shaped air purifying agent prepared in Example 1 (Honey No.:l:+1!l) (KMnO<7% by weight
The column was packed with 1 ppm 11.3 gas and air at room temperature and atmospheric humidity (relative humidity 60%) was passed through the column at 8000 hours with an SV value of 2500.
The gas removal rate was monitored by gas chromatography analysis (sensitivity 0.02 ppb) L/L after passing through the gas over time, and the removal rate of 11□S gas was still over 99% even after 8000 hours. Met.

[Effects of the Invention] The air purifying agent according to the present invention is lighter and has higher mechanical strength than, for example, conventional honeycomb molded air purifying agents, so reliability is improved, and air purifying ability is also maintained at a certain level. It can be demonstrated with good reproducibility at various levels.

That is, since the air purifying agent according to the present invention is lightweight and has mechanical strength, it can be easily molded and can be incorporated into desired equipment such as filters, air conditioners, and coolers. Air can be purified by effectively removing bad odors or harmful gases originating from the environment. In particular, the honeycomb body has a low pressure loss, so it can function satisfactorily even with a small amount of airflow and can be used for a long time.

Claims (4)

[Claims] (1) An air purifying agent comprising an inorganic fiber paper supporting a soluble oxidizing agent as an active ingredient. (2) The air purifying agent according to claim 1, wherein the inorganic fiber paper is formed into a honeycomb molded body. (3) The soluble oxidizing agent is at least one or two selected from potassium permanganate, chromate, or potassium ferrate.
The air purifying agent according to claim 1, which is more than 1 species. (4) Soluble oxidizing agent: 1 to 1 per air purifying agent (dry basis)
The air purifying agent according to claim 1 or 3, which is supported on 20% by weight inorganic fiber paper.